Four images from the same subject showing a right carotid artery at the bifurcation. The sharpness of the vessel wall is illustrated wit the different imaging parameters. There was a significant improvement in the quality of the images in the NE and E images compared with the N and 'none' images. p < 0.001, where NE = navigator and ECG-gated, N = navigator gated only. E = ECG-gated only and 'none' = no gating.